When Sarah and Kelly are hiding from the raptor in the compound, observe as Sarah looks at the floor, the wall is made out of that greenish wavy plastic roofing material. The next shot shows the raptor trying to get in from under the door. Ok, here is the slip up: in the very next scene you see Sarah kicking at the wood trying to get out of the complex.

How, in one shot, did the wavy green material magically change to old, beat up wood in the next?